v3.26.1
Insider Trading Arrangements
 3 Months Ended
Jun. 30, 2026
shares
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement
The following table reports information regarding the adoption of "Rule 10b5-1 trading arrangements" or "non-Rule 10b5-1 trading arrangements," as defined in Item 408(a) of Regulation S-K, during the three months ended June 30, 2026 for Southern Company's directors and "officers," as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended. There were no modifications or terminations of such trading arrangements during the three months ended June 30, 2026. Unless otherwise indicated, each trading arrangement listed below is a "Rule 10b5-1 trading arrangement," provides for the sale of shares of Southern Company's common stock, commences no earlier than the expiration of the cooling-off period required by Rule 10b5-1(c)(1)(ii)(B)(1) under the Securities Exchange Act of 1934, as amended, and terminates upon the earlier of the "Expiration Date" listed below or the completion of all sales. The Subsidiary Registrants had no reportable trading arrangements for the three months ended June 30, 2026.
Name
Title
Date of Adoption
Expiration Date
Aggregate Number of Shares Covered
Peter P. Sena IIIChairman, President, and Chief Executive Officer of Southern NuclearMay 5, 2026September 1, 20274,266
Non-Rule 10b5-1 Arrangement Adopted false
Rule 10b5-1 Arrangement Terminated false
Non-Rule 10b5-1 Arrangement Terminated false
Peter P. Sena III [Member]  
Trading Arrangements, by Individual  
Name Peter P. Sena III
Title Chairman, President, and Chief Executive Officer of Southern Nuclear
Rule 10b5-1 Arrangement Adopted true
Adoption Date May 5, 2026
Expiration Date September 1, 2027
Arrangement Duration 484 days
Aggregate Available 4,266